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2A674 Volume 2 Unit 3 STQ
Terms in this set (51)
What switch indicates a flow- or no-flow condition?
Fuel-flow indicating switch.
What is the purpose of a fuel-level control valve?
To permit the automatic control of fuel level during the filling of a fuel tank.
Upon what principle does a fuel-level control valve operate?
Upon what principle does the piston-type of fuel-level control valves operate?
Outline the operation of the piston-type fuel-level control valve.
Fuel pressure pushes piston open and fuel enters tank; fuel passes through piston, pushes pilot valve open, and into tank; when tank is nearly fuel, float rises and closes pilot valve; fuel pressure inside valve is now equal to the pressure holding the piston open; spring pressure helps close the piston valve to prevent fuel from entering the tank.
How is the diaphragm-type valve controlled?
Can the dual-float fuel-level control valve be replaced from outside or inside the fuel tank?
Inside; it requires tank entry.
What is the purpose of the dual floats on a dual-float valve?
They provide a double safety factor.
What is the primary advantage of the SPR method of ground refueling?
It allows all fuel tanks to be refueled from a single connection.
What is the maximum fuel-flow capability of each SPR on the cargo aircraft refuel system?
600 gallons per minute.
What location are all single-point refueling operations controlled from?
The fuel-management panel.
After the selected tanks on the cargo aircraft are refueled, how much air space is left at the top of each tank?
Approximately three percent.
How is the SPR OPENED and CLOSED?
By engaging the lever on the refueling nozzle; by spring tension when the lever is retracted.
Which valves connect the ground refueling manifold/ SPR to the main (wing) manifold?
Refuel isolation valves.
During ground refueling, what actin could you take to alternately close the primary and secondary sides of the fuel-level control valves of the tanks taking fuel?
Placing the PRECHECK switch first to PRI, then SEC position.
What valve, when opened, will allow fuel to flow from the SPR to the main (wing) manifold?
The LH and RH refuel isolation valve.
In addition to the fuel-level control valves and refueling isolation valve, what valves must be OPENED to permit refueling of all tanks on the cargo aircraft?
The center separation valve, as well as the left- and right- separation valves.
What components should be checked during the first few minutes of the refueling operation?
The primary and secondary fuel-level control valves should be operationally checked to ensure they will stop the flow of fuel into the tank when the desired level has been reached.
What is the first step in defueling a cargo aircraft?
Turn on the pumps in all tanks to be defueled.
Which fuel tanks can supply fuel directly to the LH refueling isolation valve without opening additional valves?
No. 2 AUX and no. 2 EXT RG tanks.
What component(s) control fuel flow from the refuel manifold to the reservoir tanks during refuel?
Two refuel shutoff valves.
What is the primary function of the refuel/ transfer float valves?
They control the refuel shutoff valves and the external tank-transfer shutoff valves.
Where are the refuel shuttle valves located?
There is one in each reservoir tank.
What type of valve is the wing pylon/ tank assembly selective refueling fuel shutoff valve?
A manually operated ball-type (globe) valve.
What sequence are the FWD fuel system tanks refueled in?
The FWD reservoir tank will fill first, then the F-2 tank, F-1 tank, and right wing tank.
When the aft fuel system is refueled, what component will cause the refuel shutoff valve to CLOSE?
The high-level shutoff valve.
Which component in the external wing tanks causes the refuel/ transfer valve to CLOSE when the tank is full?
The refuel shutoff valve.
As an aircraft fuel systems craftsman, what would you be expected to do if a discrepancy should develop on an aircraft refueling system?
To know the typical components and operating principles of a refuel system on all types of aircraft; to evaluate any discrepancies involving the system; and choose the most probable cause.
During the refueling operation of a fighter aircraft, fuel begins to vent overboard and the refueling shutoff valve will not close. What would be the most probable cause for this malfunction?
Refuel valve is inoperative.
What three parts make up the UARRSI?
A receptacle, slipway door, and signal/ voice amplifier.
Explain how the slipway door on the UARRSI is opened.
The slipway door is opened by pulling down the T-handle on the aerial refuel panel, which activates a hydraulic actuator that opens the door.
Where is the aerial refueling lighting matrix on the bomber aircraft located?
The windshield center post.
Which light on the lighting matrix allows the pilot and copilot to know if all conditions are satisfied prior to aircraft connection?
The blue READY/ NWS advisory light.
Where is the aerial refuel panel located on the bomber aircraft?
On the forward crew compartment center overhead panel.
Which valve in the aerial refueling system directs accumulator pressure to hydraulic system No. 3 reservoir when the manual control handle is set to the OPEN position?
The accumulator dump and relief valve.
Explain what events are initiated when the pull-to-refuel handle is pulled down to the OPEN position.
The slipway doors will unlock and open, and the aerial refueling electrical circuity is energized.
What action initiates the aerial refueling process?
Placing the MODE switch of the aerial refuel panel in the NORM position and pulling down on the PULL REFUEL T-handle.
Explain what events occur when electrical power is supplied to the aerial refuel power supply.
The slipway doors begin to open, causing the OPEN/ UNLK light to illuminate; the aerial refueling amplifier activates; the slipway lights are energized; and the slipway door manual valve is opened, pressuring the OPEN side of the slipways door hydraulic actuator and opening the slipway door.
After boom and receptacle connection, what components allow aerial refueling signals and intercom between tanker and receiver to take place?
What indication should you receive when the tanker's boom enters the refueling receptacle and actuates the contact switch?
The green LATCHED lights illuminates and the blue READY/ NWS light extinguishes.
What conditions would result in an automatic disconnect of the boom and receptacle?
A high-pressure condition occurs or the boom travel limits are exceeded.
What four secondary events should occur after the boom and receptacle are disconnected?
The DISC caution light illuminates, the LATCHED light extinguishes, tanker and receiver intercom systems are disconnected, and the FCGMS is switched from aerial refueling to transfer mode.
After a manual disconnect is initiated, what action resets the UARRSI and signal amplifier, resulting in the illumination of the READY/ NWS light?
Pressing the pilot or copilot trigger switch to the first detent.
What switch controls the reverse aerial refueling operation?
The MODE-REV switch on the aerial refuel panel.
What computer system on the bomber aircraft monitors the conditions and configurations of the aerial refueling system both in flight and on the ground?
What do the first two digits of a CITS maintenance code idetify?
The aircraft system containing the malfunction.
When interpreting a fault code, what would indicate that a fault-isolation diagram is provided?
When the fifth digit is an A through W.
What would a seven-digit fault code identify?
The faulty LRU.
What type of diagram would identify an aerial refueling malfunction discovered by the flight crew that was not detected by CITS?
A fault-identification diagram.
What aerial refueling discrepancy is identified by fault code 28-25-AM?
"No latched light with A/R nozzle latched."
During fault isolation of an aerial refueling malfunction, where would you enter a PMC?
CITS control and display panel in the aft crew station.
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